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in music, a perpetual canoncanon,
in music, a type of counterpoint employing the strictest form of imitation. All the voices of a canon have the same melody, beginning at different times. Successive entrances may be at the same or at different pitches.
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 on a tune that returns to its beginning in which all the voices enter at the unison or the octave. An example is Sumer Is Icumen InSumer Is Icumen In
[M.E.,=summer has (literally: is) come in], an English rota or round composed c.1250. It is the earliest extant example of canon, of six part music, and of ground bass. Four tenor voices are in canon and two bass voices sing the pes, or ground, also in canon.
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. Rounds were popular in 17th-century England when the catch reached its height. The catch was originally just a simple round, e.g., Three Blind Mice, written in a single line with the effect gained by having another singer come in ("make the catch") at the right time. Later, comic effects, often quite bawdy, were added, using the interweaving of the parts. The Rounds, Catches and Canons of England (1864) by E. F. Rimbault is a comprehensive collection. The term round was also used to designate a dance performed in a circle and, by extension, to the tunes for such dances.


A series of shots fired either simultaneously or with delay periods between them.
To pass and alter direction of travel, as a vessel rounds a cape.
A single munition, missile, or device to be loaded on or in a delivery platform, vehicle, or device for purposes of expenditure; the configuration of the round may vary.


1. A wood plane for cutting grooves.
3. A cylindrical metal rod.

round molding, round

A fairly large molding, the section of which is circular (or nearly circular) and convex.


1. Maths
a. forming or expressed by an integer or whole number, with no fraction
b. expressed to the nearest ten, hundred, or thousand
2. in the round Theatre with the audience all round the stage
3. a playing of all the holes on a golf course
4. Archery a specified number of arrows shot from a specified distance
5. Music a part song in which the voices follow each other at equal intervals at the same pitch
6. a sequence of bells rung in order of treble to tenor
7. a dance in which the dancers move in a circle


To eliminate rightmost digits in a number when absolute precision is not required or used. One of the most common uses of rounding is with dollar amounts, which can result in more than two decimal places after a division. Following are four of many rounding methods:

  Round Half Up    3.455 -> 3.46
                   3.454 -> 3.45

  Round Half Down  3.455 -> 3.45
                   3.456 -> 3.46

  Round Up         3.456 -> 3.46
                   3.453 -> 3.46

  Round Down       3.458 -> 3.45
                   3.453 -> 3.45

Rounding and a Lot More
For more ways to round numbers than you can imagine, as well as to learn how computers perform mathematical functions at the circuit level, read the entertaining and informative book, "How Computers Do Math" by Clive "Max" Maxfield and Alvin Brown. (John Wiley & Sons, Inc. 2005, ISBN 0-471-73278-8).
References in periodicals archive ?
The makers insist that it's the roundest ball ever, but just how round does a ball need to be?
Dipping The adidas Jabulani is the lightest and roundest ball in World Cup history - and many keepers have already been spooked by its wildly unpredictable movement.
In a bid to create the perfect match ball, companies have turned to science and adidas claims the Jabulani, which means 'to celebrate' in Zulu, is the 'roundest ever'.
Horse/Pony with Roundest Bottom - 1 Rachel Fielder (Barney), 2Megan Fletcher (Rodney), 3 Alfie Cooper (Blondie), 4 Molly Arthur (Treacle), 5 Katie Turner (Doodles), 6 Sarah Morris (Molly).
He was rewarded with a 3-0 win - Liverpool's first victory in the league since Boxing Day-despite the fact that, in some cases, he had the squarest of pegs playing in the roundest of holes.
It was determined by measuring the diameter of 1000 of the largest, roundest oocytes in the sections, and by measuring fresh oocytes.
I once had an argument with a colleague ab out the roundest word in the language (these things matter, honestly).
The vermiculite particles were the craggiest, the spheres the roundest, and the sand grains, says Melosh, were somewhere in between.
The Sun is nearly the roundest object ever measured.
Leave the largest and roundest fruit to develop with the space of a fist between them.
The new ball is claimed to be the truest and roundest ever produced and, like the adidas Teamgeist ball of 2006, the theory is that it allows players of skill to impart spin to tip the balance of power between striker and goalkeeper in the striker's favour so producing more goals.